93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
||
|
|
/*
|
||
|
|
* Copyright (c) 2013, NVIDIA Corporation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Support for the Trusted Foundations secure monitor.
|
||
|
|
*
|
||
|
|
* Trusted Foundation comes active on some ARM consumer devices (most
|
||
|
|
* Tegra-based devices sold on the market are concerned). Such devices can only
|
||
|
|
* perform some basic operations, like setting the CPU reset vector, through
|
||
|
|
* SMC calls to the secure monitor. The calls are completely specific to
|
||
|
|
* Trusted Foundations, and do *not* follow the SMC calling convention or the
|
||
|
|
* PSCI standard.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef __FIRMWARE_TRUSTED_FOUNDATIONS_H
|
||
|
|
#define __FIRMWARE_TRUSTED_FOUNDATIONS_H
|
||
|
|
|
||
|
|
#include <linux/printk.h>
|
||
|
|
#include <linux/bug.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/cpu.h>
|
||
|
|
#include <linux/smp.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
|
||
|
|
#include <asm/hardware/cache-l2x0.h>
|
||
|
|
#include <asm/outercache.h>
|
||
|
|
|
||
|
|
#define TF_PM_MODE_LP0 0
|
||
|
|
#define TF_PM_MODE_LP1 1
|
||
|
|
#define TF_PM_MODE_LP1_NO_MC_CLK 2
|
||
|
|
#define TF_PM_MODE_LP2 3
|
||
|
|
#define TF_PM_MODE_LP2_NOFLUSH_L2 4
|
||
|
|
#define TF_PM_MODE_NONE 5
|
||
|
|
|
||
|
|
struct trusted_foundations_platform_data {
|
||
|
|
unsigned int version_major;
|
||
|
|
unsigned int version_minor;
|
||
|
|
};
|
||
|
|
|
||
|
|
#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)
|
||
|
|
|
||
|
|
void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
|
||
|
|
void of_register_trusted_foundations(void);
|
||
|
|
bool trusted_foundations_registered(void);
|
||
|
|
|
||
|
|
#else /* CONFIG_TRUSTED_FOUNDATIONS */
|
||
|
|
static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void register_trusted_foundations(
|
||
|
|
struct trusted_foundations_platform_data *pd)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* If the system requires TF and we cannot provide it, continue booting
|
||
|
|
* but disable features that cannot be provided.
|
||
|
|
*/
|
||
|
|
pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
|
||
|
|
pr_err("Secondary processors as well as CPU PM will be disabled.\n");
|
||
|
|
#if IS_ENABLED(CONFIG_CACHE_L2X0)
|
||
|
|
pr_err("L2X0 cache will be kept disabled.\n");
|
||
|
|
outer_cache.write_sec = tf_dummy_write_sec;
|
||
|
|
#endif
|
||
|
|
#if IS_ENABLED(CONFIG_SMP)
|
||
|
|
setup_max_cpus = 0;
|
||
|
|
#endif
|
||
|
|
cpu_idle_poll_ctrl(true);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void of_register_trusted_foundations(void)
|
||
|
|
{
|
||
|
|
struct device_node *np = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");
|
||
|
|
|
||
|
|
if (!np)
|
||
|
|
return;
|
||
|
|
of_node_put(np);
|
||
|
|
/*
|
||
|
|
* If we find the target should enable TF but does not support it,
|
||
|
|
* fail as the system won't be able to do much anyway
|
||
|
|
*/
|
||
|
|
register_trusted_foundations(NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool trusted_foundations_registered(void)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
#endif /* CONFIG_TRUSTED_FOUNDATIONS */
|
||
|
|
|
||
|
|
#endif
|